Tag Archives: validation

Data Management Questionnaire

Posted on March 24, 2010 by Jonathan Callahan

Sometimes merely filling out a questionnaire can cause you to think about problems in a new way.  When asked to answer a question that has never occurred to you before, you may find yourself reevaluating some of your core assumptions …   read more …

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Zero vs. Missing

Posted on February 25, 2010 by Jonathan Callahan

On the left we have zero, our integer measure of nothingness.  On the right we have missing value, aka N/A, aka NA, our signal that the value of a datapoint is unknown.  Everyone who deals with data has to deal …   read more …

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Standard Latitudes and Longitudes

Posted on June 9, 2009 by Jonathan Callahan

What?  Where?  When? These are key questions that every scientist or other collector of data must answer. What is the value of the thing we are measuring? Where are we taking the measurement? When are we taking the measurement? In …   read more …

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